Panny 25mm 1.4 vs Olympus 25mm 1.8 Reviewed

Started Feb 15, 2014 | Discussions thread
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Re: Panny 25mm 1.4 vs Olympus 25mm 1.8 Reviewed
In reply to Dheorl, Feb 16, 2014

Dheorl wrote:

dgrogers wrote:

Robin Wong has compared the Panny 25mm 1.4 to the Olympus 25mm 1.8.

There are some interesting points. First, the Panasonic required a slower shutter speed at the same aperture, meaning there may be a difference in the way Olympus measures their f/stop and the way Panasonic does.

f/stop is I think pretty much a calculated thing rather than a measured thing. It's an fixed formula, not something that's up for debate. T-stop however can change for any given f-stop. I don't know the optical constructions of both but if for instance the oly had less elements it might have a slightly better comparative t-stop.

This is true. However, there are differences in how different companies round f numbers. 1.26 is rounded to f/1.2 by Canon, but other companies round it to f/1.3. That's why if you put a 85mm f/1.2L on a metabones AF adapter for NEX, you'll get the camera reporting f/1.3.

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